Theoretical investigations of the hyperfine structure of the hydrogen molecular ion (one electron and two protons) are discussed. The nuclear spin-rotation interaction has been found to be of the same sign as in the hydrogen molecule and the hyperfine transition frequencies can be accurately predicted. With measurements of the hyperfine structure of the deuterium molecular ion (or of HD) it sho...

Mössbauer spectrometry gives electronic, magnetic, and structural information from within materials. A Mössbauer spectrum is an intensity of γ-ray absorption versus energy for a specific resonant nucleus such as Fe or Sn. For one nucleus to emit a γ-ray and a second nucleus to absorb it with efficiency, both nuclei must be embedded in solids, a phenomenon known as the “Mössbauer effect.” Mössba...

The Na cluster has proven to be interesting from the experimental and theoretical point of view, and two of its electronic states, the and states, have been subject to several spectroscopic investigations. The state, and the ground state, are dominated by Jahn-Teller induced rovibronic effects, while in the state an almost free pseudorotational motion takes place. Although the two former states...

The material systems include GaAs/AlGaAs semiconductor heterostructures, semiconducting nanowires and carbon nanotubes. These materials have their own advantages that can be employed to engineer a spin-friendly environment. These include fabrication and electrical-control issues as well as the strength of the hyperfine interaction (i.e. presence or absence of nuclear spins) and the spinorbit in...

The hyperfine interaction of phosphorus donors in fully strained Si thin films grown on virtual Si(1-x)Ge(x) substrates with x< or =0.3 is determined via electrically detected magnetic resonance. For highly strained epilayers, hyperfine interactions as low as 0.8 mT are observed, significantly below the limit predicted by valley repopulation. Within a Green's function approach, density function...

We analyze second-order M1-M1 and M1-E2 effects on the hyperfine structure HFS of the lowest-energy P states of alkali-metal atoms arising from the coupling of the two J=1 /2,3 /2 fine-structure levels through the hyperfine interaction. We find these effects to be especially sizable in Li, leading to a 9 correction to the most accurate reported experimental value of the A P1/2 HFS constant of L...